JPS59114059A - Transfer table for thermal transfer equipment - Google Patents

Abstract

PURPOSE:To enable effective heating of a pressure plate by a method wherein the body of a table is made up of a pressed substrate comprising a non-conductive hard insulator and a conductive pressure plate is mounted on the outer surface thereof to perform a self-generation of heat with an electromagnetic induction by an induction coil within the body of the table. CONSTITUTION:In a heat transfer machine, as a high frequency current flows through an induction coil 14 in the body 12 of a table, an alternating magnetic field is generated and transmits with a non-conductive pressed substrate 12b without acting thereupon at all and acts upon a conductive pressure plate 13 alone to induce an induction current according to changes in the magnetic field within the pressure plate. In this manner, the pressure plate 13 generates heat due to an ohm loss thereof and concentrates it on the pressed surface 13a without waste being intercepted with a heat insulating pressed substrate 12b. This enables effective and quick heating of the pressure plate thereby eliminating preheating at the start of the transfer work while shortening the required time for temperature recovery at each transferring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a transfer plate installed in a thermal transfer machine, and in particular to an improvement regarding the heating method of the transfer plate, and an improvement in which the pressing side of the plate can be heated efficiently and quickly. It is something to do.

By the way, a transfer film having a transfer foil polymerized on one side of a film base is used, and the film is heated and pressed onto the surface of an object to be transferred, thereby transferring the transfer foil to the surface of the object. In such a thermal transfer machine, since it is necessary to heat the transfer film, the transfer plate for pressing the film must also be heated to a required temperature K in advance.

Therefore, the conventional transfer plate is like a stone as shown in FIG.

An internal solid metal plate body 2 supported at the tip of a press shaft l, and a pressure plate 3 fixed to the pressing side of the body, this pressure plate 3 is built into the plate body 2. A method is adopted in which heating is performed using a heated heater 4.

However, the conventional heating method has the following problems. In other words, with this heating method, it is necessary to sufficiently preheat the panel body 2, which has a large heat capacity, with the heater 4, and because there is a lot of wasteful heat radiation from the panel body 2 to the surroundings, All of the heat cannot be used effectively to heat the pressure plate 3, and since the supply of heat from the heater 4 to the pressure plate 3 relies on thermal conduction, the way the heat is transferred to the shield plate is limited. There are disadvantages such as slow heating, making it impossible to efficiently and quickly heat the pressure plate 3. Therefore, it takes time to preheat the pressing surface 3a of the pressure plate 3 to the required temperature at the start of the transfer operation. Even during the transfer operation, it takes too much time to recover the temperature of the pressing surface 3a, which decreases with each direction of rotation. With this heating method, the pressure plate 3 cannot be heated efficiently as described above, so if the pressure surface 3a is to be kept at the required temperature, the plate body 2 must be kept at a higher temperature. Therefore, the output of the heater 4 has to be increased by that amount in order for the heater to cool down, and together with the above-mentioned waste due to heat radiation in the tropics, the power consumption of the heater is very large. In addition, in this heating method, since heating of the pressure plate 3 depends on heat conduction from the plate body 2, the temperature of the suppressing surface 3a is unstable, and therefore, temperature control of the core portion is extremely troublesome.

Furthermore, with this heating method, the board body 2 is constantly heated during the transfer process, so there is a risk of burns to workers who accidentally come into contact with it, and there are concerns that heat radiation to the surrounding area may worsen the work environment. In addition, changes in the axial length due to thermal expansion of the press shaft 1 due to heat conduction to the press shaft 1 may cause fluctuations in the transfer pressure when pressing the transfer film 5 against the surface of the object 6 to be transferred. be. On the other hand, a long film is used as the transfer film 5, and while it is stretched under an appropriate tension, it is intermittently fed between the pressure plate 3 and the article 6 in required lengths. However, under the heating method described above, the part of the film to be used next time during transfer is heated by radiant heat from the board body 2, and undesirable elongation and wrinkles in the longitudinal direction are prevented. Because it is difficult to avoid it happening.

During the next transfer, due to the elongation that is difficult to specify,
It takes time and effort to position the pattern to be transferred, and the wrinkled area cannot be used, resulting in a large amount of wasted film. However, problems associated with such undesirable elongation and wrinkles of the transfer film 5 become more noticeable as the suppression area of the pressure plate 3 becomes smaller compared to the size of the plate body 2. is the suppression area of the pressure plate 3,
Therefore, the transfer area is almost the same regardless of its size, which causes the inconvenience.

The present invention solves the above-mentioned conventional problems regarding transfer plates. In order to efficiently and quickly heat only the pressure plate attached to the suppression side of the panel, we adopted a heating method using electromagnetic induction.

The conductive pressure plate generates heat by itself. This will be described in detail below with reference to the embodiment shown in FIGS. 2 and 3.

Reference numeral 11 in the figure denotes a press shaft which can be raised and lowered at any time in the direction of arrow (A) by known means, and a plate body 12 is supported at its tip. This board body 12 is formed of an internal hollow housing 12a that is open on the pressing side, and a pressing board 12b that closes the open pressing side, and a pressing plate 13 is attached to the outer surface of the board. Fixed and replaceable. The pressure plate 13 is provided in the internal space of the panel body 12.
An induction coil 14 for heating the pressure plate 13 is installed as close as possible to the inner surface of the suppression board 12b so that the generated magnetic field can be concentratedly applied to the pressure plate 13.

Therefore, the suppression board 12a is made of a material 1 that is not susceptible to the influence of the magnetic field described above and has great mechanical strength, for example, a conductive hard insulating material such as ceramic, and is made of a pressure plate 13, A book is made of a conductive material 1 that is easily affected by a magnetic field, such as a metal, preferably a ferromagnetic material such as iron. Also, the pressure plate 13 is a long transfer film 15
It has a suppression area corresponding to the surface area of the transfer target article 16 which faces the transfer object 16 via the transfer object, as shown in FIG.

For articles 16' with a small surface area, a pressure plate 13' with a small suppression area is used. In any case, the pressing surface 13a of the pressure plate 13 outer block 13' is shaped like a relief plate as shown in the figure when partial transfer is to be performed on the surface of the article 16, and the press surface 13a of the pressure plate 13 is formed into a letterpress shape as shown in the illustration. When it is intended to be applied, a planar shape is used. Note that the induction coil 14 is controlled by a drive circuit 18 controlled by a controller /L'times IU'/
is connected to the high frequency generation source 19 via the coil 9, and the high frequency power of ff, -3'lH necessary for heating the pressure plate 13 to the required temperature is supplied to the coil 4 at any time.

In the above configuration, when a high frequency current is passed through the induction coil 14, the coil generates an alternating magnetic field. This magnetic field passes through the non-conductive pressure plate 12b without acting on it, acts only on the conductive pressure plate 3, and induces an induced current in the pressure plate according to the change in the magnetic field. induce Therefore, the pressure plate 13 alone is heated mainly by the heat generated by the ohmic loss of the induced current, and the amount of heat is blocked by the heat-insulating suppressing substrate 12b and is wastedly concentrated on the pressing surface 13a. Ru.

However, as described above, electromagnetic induction heating has much higher thermal efficiency than heating by thermal conduction using the conventional heater 4, and therefore can rapidly increase the temperature of the pressure plate 13. Only the pressure plate 13 in the entire transfer plate is heated when the plate is heated, but this pressure plate 13 has a much smaller heat capacity than the plate body 2, which is heated in the conventional example. , much less heat is required to heat the material to the required temperature. However, since the pressure plate 13 is directly heated by its own heat generation, there is a delay of about one hour, unlike indirect heating due to heat conduction from the plate body 2 as in the conventional example. Table. Therefore, when starting the transfer operation, the pressure plate 13 can be easily heated to the required temperature within a few seconds, so there is no need for preheating, which was required in the past. , pressure plate 13
Since the temperature that has decreased due to the transfer can be recovered in a small amount of time, if the time interval between each transfer is several seconds or more, it is only necessary to heat the pressure plate 13 just before the start of each transfer. It is especially necessary to keep the shield plate constantly heated.

Moreover, according to this electromagnetic induction heating, the pressure plate 13 has −
1.Almost all of the observed heat can be effectively used only for transfer, 1.There is only a small amount of wasted heat dissipated by radiation to the surroundings.
Coupled with the above-mentioned efficient heating, the amount of electricity required for heating can be significantly reduced compared to the conventional example, and with regard to temperature control of the pressure plate pressing surface 13a, unstable factors such as heat radiation can be almost eliminated. Since there is no need to take this into account, the suppression surface temperature can be easily adjusted by controlling the amount of power supplied to the induction coil 14, and does not require any effort.

Furthermore, in the above-mentioned electromagnetic induction heating, only the pressure plate 13 is heated and the heat conduction from the first shield plate to the panel body 2 is blocked by the suppression board 12b. Since there is no danger of inflicting damage, and no heat radiation is seen from the main body to the surroundings, deterioration of the thermal printing environment can be avoided, and since there is no thermal expansion of the press shaft 11, full transfer pressure is achieved. There is no danger.

On the other hand, the above-mentioned long transfer film 15 is intermittently supplied between the pressure plate 13 and the article 16 at a required length while being stretched under an appropriate % fx tension as in the conventional case. ,
Since the heat radiation from the disk body 12 is strong, the portion of the film to be used next time is not heated during transfer, and therefore, it is possible to cause the portion to stretch or wrinkle as desired. Therefore, it is easy to position the pattern to be transferred at the time of the next transfer, and there is no waste of the film used, and the amount used at one time can be kept almost equal to the pressing area of the pressure plate 13.

Therefore, the amount of stones used in the pressure plate 13' shown in FIG. 3 is naturally smaller than that of the pressure plate 13 shown in FIG. 2.

As described above, one aspect of the present invention is to construct the suppressing side of the internal hollow disk body with a suppressing substrate made of a conductive hard heat insulating material, and attaching a conductive pressure plate to the outer surface of the substrate. An alternating magnetic field generated by an induction coil is applied to the pressure plate to cause the pressure plate to self-heat by electromagnetic induction. Therefore, according to the present invention,
Compared to the conventional method that uses heat conduction from a heater built into the disk body, the pressure plate can be heated efficiently and quickly, eliminating the need for preheating at the start of transfer work, and reducing the time required for temperature recovery for each transfer. This makes it possible to significantly improve the efficiency of the transfer work, and since there is no wasteful heat radiation, power consumption can be reduced in conjunction with the above-mentioned efficiency of the pressure plate and heating. At the same time, it is possible to avoid wasting the amount of transfer film used, and it is possible to achieve a significant reduction in transfer costs.Furthermore, it is easy to control the temperature of the pressing surface of the pressure plate.There is no fluctuation in transfer pressure, and transfer film Because it is easy to align the design, it is possible to always achieve good transfer, and it is possible to avoid the risk of burns and unnecessary external heat radiation to the surrounding area, which improves the safety and good quality of transfer work. A work environment can be secured.

[Brief explanation of drawings]

FIG. 1 is a front view showing a conventional example, FIG. 2 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 3 is a front view showing another embodiment. 11...Press shaft, 12-Panel body, l2. b・-
Press board, 13-, pressure plate-14-, induction coil, 15-
-Transfer film, 16--Article to be transferred, 19--High frequency source Applicant Ohira Kogyo Co., Ltd. Fallen/(Rental'-E1-)

Claims (1)

[Claims] (1) The suppressing side of the internally hollow board body is composed of a pressing board made of a hard heat insulating material with no conductivity. A conductive pressure plate is attached to the outer surface of the substrate,
In the internal space of the panel body, there is an induction coil connected to a high frequency source for applying an alternating magnetic field to the pressure plate.
A transfer plate of a thermal transfer machine, characterized in that the transfer plate is installed close to the inner surface of the suppression substrate.